> From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss- > boun...@opensolaris.org] On Behalf Of Erik Trimble > > Honestly, I think TRIM isn't really useful for anyone.
I'm going to have to disagree. There are only two times when TRIM isn't useful: 1) Your demand of the system is consistently so low that it never adds up to anything meaningful... Basically you always have free unused blocks so adding more unused blocks to the pile doesn't matter at all, or you never bother to delete anything... Or it's just a lightweight server processing requests where network latency greatly outweighs any disk latency, etc. AKA your demand is very low. or 2) Your demand of the system is consistently so high that even with TRIM, the device would never be able to find any idle time to perform an erase cycle on blocks marked for TRIM. In case #2, it is at least theoretically possible for devices to become smart enough to process the TRIM block erasures in parallel even while there are other operations taking place simultaneously. I don't know if device mfgrs implement things that way today. There is at least a common perception (misperception?) that devices cannot process TRIM requests while they are 100% busy processing other tasks. Or your disk is always 100% full. I guess that makes 3 cases, but the 3rd one is esoteric. _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
